Multiple Choice
Which of the following is the number of protons in a gallium (Ga) atom?
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2. Atoms & Elements
Periodic Table: Element Symbols
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As of 2024, how many elements are officially recognized on the periodic table?
A
118
B
120
C
112
D
104
Verified step by step guidance1
Understand that the periodic table is a tabular arrangement of chemical elements, organized by increasing atomic number, electron configurations, and recurring chemical properties.
Recognize that the number of officially recognized elements corresponds to the highest atomic number of elements that have been confirmed and accepted by the International Union of Pure and Applied Chemistry (IUPAC).
Recall that as of 2024, the periodic table includes all elements from atomic number 1 (Hydrogen) up to the highest confirmed element, which is Oganesson with atomic number 118.
Note that elements beyond 118 have not yet been officially recognized or confirmed, so the total count of officially recognized elements remains 118.
Therefore, the correct answer is the total number of elements with atomic numbers from 1 to 118, which is 118.
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